Will it pass MOT with no backbox?

[tommycx]

Would my car pass the MOT if i cut my backbox off and then replace it with a straight bit of pipe in its place?

 

[Seatmann]

I haven't heard of any not passing yet, I don't think they're loud enough to fail and the emissions test is easy.

 

[tommycx]

Okay good. Thanks for the quick reply.

 

[ibiza95]

i was told today that they need at least 1 silencer for mot :S

 

[Slimy]

Don't diesels have two silencers by default then?

 

[ibiza95]

my alhambra has 2 so i assume so

 

[Seatmann]

No, some do, some don't, mine has the cat ad a back box.

 

[andypandypoos]

my Ibiza had a cat and a backbox as well

 

[Seatmann]

Would my car pass the MOT if i cut my backbox off and then replace it with a straight bit of pipe in its place?

I spoke to my MOT man today, he says you don't need any boxes at all as long as the car's not to noisy. That's all the boxes are for after all, noise, the cat doesn't matter because we don't have any strict emission test for the tdi's yet so it's all good.

 

[Pimped up vario]

I suppose it all depends who you get on the day. I read the info on the link from the mot requirements for vehicles in Northern Ireland and reckon if someone felt like it they could probably fail mine for not having a cat. the same could be said of silencers being absent.


http://www.dvlni.gov.uk/Freedom%20of%20Information/Light%20Vehicle%20Inspection%20Manual/Exhaust%20System.pdf

 

[Seatmann]

They can't say anything about the cat because we don't have a cat test for diesels, just a smoke test but if the exhaust is to loud it can fail or have an advisory. I spoke to my usual mot guy yesterday though and he assured me that a tdi can have a total straight pipe and pass no problem.

 

[AddersHTID]

mot's are mainly for safety and emissions so i guess if its not to noisy and it passes the emissions test they shouldn't have a problem with it.

 

[Pimped up vario]

a. A part of the system missing or excessively deteriorated.

Doesn't say diesels are excluded from this stipulation. As for the noise aspect it's not very clear is it? They don't exactly state a db limit. I forget what the police say is acceptable. Just as well diesel engines, although they are given the image of noisey, actually put a lot less energy into making sound than petrol engines so therefore are alot quieter.

 

[Seatmann]

it's because of the turbo, it breaks up the noise quite a bit. I used to have a old renault 5 gordini turbo and all it had was a pretend box right at the back, little tiny straight through thing lol. Even that still went through the mot ok.

 

[Pimped up vario]

Mine has a straight through with one silencer and it passed the MOT. When I get my camera sorted (shower near caught fire this wkend, how many times do you have your head stuck in the electric cupboard) and post some pics of it you'll wonder how it passed. I was actually hoping it would fail so that I could force the garage to amend it.

 

[john_tdi]

this pops up every few months. Diesels just don't need a cat to pass an mot.

 

[mk4 cupra]

No diesels don't need a cat at the mo for m o t and would still passes as long as they pass the emmisons test but diesels are more just a smoke test unlike its petrol counter part

One thing I will say is te way things are going with emmisons these days and diesels being hit the hardest I don't belive it would be too long till diesel cars will hve to have a full emmision test

 

[Seatmann]

It'll be for newer cars though, I pay full tax so need some kind of compensation lol

 

[andypandypoos]

mine passed the MOT today with no cat and no silencers